package cn.edu.ctbu.dp01.service;

import cn.edu.ctbu.dp01.constant.REnum;
import cn.edu.ctbu.dp01.dao.StudentRepository;
import cn.edu.ctbu.dp01.entity.Student;
import cn.edu.ctbu.dp01.exception.RException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Example;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.RequestParam;

import java.util.List;

@Service
public class StudentService {

    @Autowired
    public StudentRepository studentRepository;

    /**
     * 读取所有的学生列表
     * @return List Student
     */
    public List<Student> getAll(){

        return studentRepository.findAll();
    }

    public Page<Student> getAll(Pageable pageable){
        return studentRepository.findAll(pageable);
    }

    public Page<Student> getAll(Example<Student> example, Pageable pageable){
        return studentRepository.findAll(example, pageable);
    }

    public Student findById(int id){
        return studentRepository.findById(id).get();
    }
    /**
     * 新增学生
     * @param student
     * @return
     */
    public Student add(Student student){
        return studentRepository.save(student);
    }

    /**
     * 更新学生
     * @param student
     * @return
     */
    public Student update(Student student){
        return studentRepository.save(student);
    }

    /**
     * 删除学生
     * @param id
     */
    public void delete(Integer id){
        studentRepository.deleteById(id);
    }

    public void deleteBatch(List<Integer> ids) {
        studentRepository.deleteAllById(ids);
    }

    /**
     * 按id进行查询
     * @param id 主键 整数
     * @return
     */
    public Student findById(Integer id){

        return studentRepository.findById(id).orElse(null);
    }



    public Student validateUsernameAndPassword(String sno, String password) throws Exception {
        List<Student> students = studentRepository.findBySno(sno);
        if (students.size() > 0) {
            // 可能对password加密，但我们暂时不做处理
            Student student = students.get(0);
            if (student.getPassword().equals(password)) {
                // 成功
                return student;
            } else {
                throw new RException(REnum.LOGIN_ERR);
            }


        } else {
            throw new RException(REnum.LOGIN_ERR);
        }
    }

//
//    /**
//     * 按名字进行查询 like
//     * @param name 主键 整数
//     * @return
//     */
//    public List<Student> findByName(String name){
//
//        return studentRepository.findByNameLike(name);
//    }
//
//    /**
//     * 按名字和密码进行查询
//     * @param name
//     * @param password
//     * @return
//     */
//    public List<Student> findByNameAndPassword(String name,String password){
//
//        return studentRepository.findByNameAndPassword(name,password);
//    }
//
//    public void insert(Student student){
//        studentRepository.save(student);
//    }
//
//    public void update(Student student){
//        studentRepository.save(student);
//    }
//
//    public void delete(Integer id){
//        studentRepository.deleteById(id);
//    }
}
